Glossary

SPID (Service Profile IDentifier) ‹ An alphanumeric string that uniquely identifies the service capabilities of an ISDN terminal. This is an identifier that points to a particular location in the Telco's central office switch memory where relevant details about the device are stored. Each BRI connection can have up to two SPIDs, one for each B channel.

SS7 (signalling System 7) ‹ This is a common channel signalling system used to establish ISDN call functions.

SVC (Switched Virtual Circuit) ‹ Used in packet data networking technology. Temporary virtual circuit between two users.

Switch Type ‹ The type of equipment that the telephone company uses to provide you with ISDN service.

Synchronous Data Link Control (SDLC) ‹ A discipline conforming to subsets of the Advanced Data Communications Control Procedures (ADCCP) of the American National Standards Institute (ANSI) and High-level Data Link Control (HDLC) of the International Organization for Standardization.

Used for managing synchronous code-transparent, serial-by-bit information transfer over a link connection. Transmission exchanges may be duplex or half-duplex over switched or nonswitched links. The configuration of the link connection may be point-to-point, multi-point, or loop.

Contrast with binary synchronous communication.

Synchronous transmission ‹ A data transmission scheme where the interval between transmitted characters is fixed so that start and stop bits are not required. In contrast with asynchronous transmissions, synchronous transmissions are guaranteed a specific percentage of bandwidth on the network medium.

TCP/IP (Transmission Control Protocol/Internet Protocol) ‹ Protocol for internetwork routing and reliable message delivery. TCP/IP functions at the 3rd and 4th layers of the Open Systems Interconnection model.

IP is the low level protocol for the TCP/IP protocol set. IP provides packet delivery services between nodes. On the same level as IP are ARP and RARP.

TCP is a reliable stream-delivery, virtual circuit connection-oriented protocol that runs on top of IP. Telnet, FTP, and login use TCP connec- tions.

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